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The network is experimenting with the second hour of its Thursday comedy block as it readies the 9:30 slot for the midseason comedy.

CBS is playing around with its top-rated Thursday. The block, which saw comedies expand into the 9 p.m. hour for the 2013-14 season, will switch comedies The Crazy Ones and Two and a Half Men when they return from their Olympics-induced hiatus.

The network announced Thursday that Two and a Half Men will now get the bigger lead-in from the TheBig Bang Theory/The Millers combo, airing at 9 p.m. The Crazy Ones moves to 9:30 p.m., effective Feb. 27. The change comes after both hit series lows last week.

Season-to-date, freshman The Crazy Ones and 11-season-old Two and a Half Men are completely even in ratings. Both average a 3.2 rating among adults 18-49, posting the exact same growth in live-plus-7 returns. The Crazy Ones has a slight edge among total viewers, averaging 11.6 million weekly viewers to Men's 11.5 million.

Midseason tinkering is not unfamiliar to CBS, and the hour remains a new one for the network. Mondays will see a similar retooling when How I Met Your Mother wraps its nine-season run at the end of March. 2 Broke Girls moves into the 8 p.m. half-hour to open up the night.

The Crazy Ones is now on track to complete its 22-episode season on April 17, leaving room for midseason comedy Bad Teacher. In the adaptation of the film, Ari Graynor stars as a former trophy wife looking for a new man while masquerading as a high school teacher. The sitcom debuts April 24 at 9:30 p.m.

Additionally, Unforgettable returns early. The summer drama takes over Undercover Boss' 8 p.m. Friday hour starting April 4 when the reality show wraps its season. In the last weeks of the 2013-14 season, CBS will air a three-hour block of scripted programs on Friday, as Unforgettable joins Hawaii Five-0 and Blue Bloods.